3Com 3C840 manual Address Translation Tutorial, Becoming more scarce

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ADDRESS TRANSLATION TUTORIAL

Overview	Public IP addresses are registered and can be used within a public
	network, such as the Internet. Due to the limitation of IP version 4
	address space and the growth of the Internet, public addresses are
	becoming more scarce.
	One solution to this problem is to use private addresses on small LANs
	and to use Address Translation when accessing devices on the public
	network. Address Translation changes a private address to a public
	address at the gateway of a public network.
	There are two types of address translation, Network Address Translation
	and Port Address Translation:
	■ “Network Address Translation (NAT)”
	■	“NAT Example”
	■	“Dynamic NAT”
	■	“Static NAT”
	■ “Port Address Translation (PAT)”
	■	“PAT Example”
	■	“Dynamic PAT”
	■	“Static PAT”
	■	“Default PAT”